EP0001683B1 - Un dispositif de commande dépendant de la vitesse pour remettre en position initiale un dispositif de manoeuvre - Google Patents

Un dispositif de commande dépendant de la vitesse pour remettre en position initiale un dispositif de manoeuvre Download PDF

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Publication number
EP0001683B1
EP0001683B1 EP78300415A EP78300415A EP0001683B1 EP 0001683 B1 EP0001683 B1 EP 0001683B1 EP 78300415 A EP78300415 A EP 78300415A EP 78300415 A EP78300415 A EP 78300415A EP 0001683 B1 EP0001683 B1 EP 0001683B1
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EP
European Patent Office
Prior art keywords
article
distance
signal
velocity
actuation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP78300415A
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German (de)
English (en)
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EP0001683A1 (fr
Inventor
Donald Lee Caudill
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Label Aire Inc
Original Assignee
Label Aire Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Label Aire Inc filed Critical Label Aire Inc
Publication of EP0001683A1 publication Critical patent/EP0001683A1/fr
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Publication of EP0001683B1 publication Critical patent/EP0001683B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65C—LABELLING OR TAGGING MACHINES, APPARATUS, OR PROCESSES
    • B65C9/00—Details of labelling machines or apparatus
    • B65C9/40—Controls; Safety devices
    • B65C9/42—Label feed control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65C—LABELLING OR TAGGING MACHINES, APPARATUS, OR PROCESSES
    • B65C9/00—Details of labelling machines or apparatus
    • B65C9/40—Controls; Safety devices

Definitions

  • This invention relates to a velocity compensator for controlling the initiation of an actuator as an article is moved along a path through a work station, the actuator performing a work operation on the article at the work station and requiring an actuation period from the time at which it is initiated to perform the work operation, the compensator comprising first means responsive to movement of the article upstream of the work station for providing a compensating signal having a characteristic related to the velocity with which the article is approaching a location which is at a predetermined approach distance from the work station, second means for providing a start signal when the article reaches the said location, and measuring means coupled to the said first and second means and responsive to the compensating signal and the start signal to provide an actuation signal for initiating the actuator substantially when the article is at a distance from the work station which is equal to the distance which the article travels in the actuation period.
  • a velocity compensator is meant a velocity dependent controlling device which compensates the timing of initiation of an actuator operation for the velocity of approach of an article to the work station of the actuator.
  • a known example of such a velocity compensator is described in DE-OS 26 05602 which relates to a labelling machine including an actuator in the form of a labelling stamp for stamping labels onto articles arriving at a labelling station.
  • the labelling stamp has a stamping member which is held in a raised position by an electromagnet coil and is dropped to stamp a label onto an article when the magnetic field of the coil collapses after the current to the coil is switched off.
  • This known velocity compensator has a capacitor which is charged during the time that an approaching article moves from a first position sensor to a second position sensor so that the voltage on the charged capacitor is related to the velocity with which the article is approaching the second position sensor.
  • the capacitor When the second sensor senses the article, the capacitor is switched to discharge through resistance to a level at which a Schmitt trigger circuit produces a signal which switches off the current to the coil of the labelling stamp, so that the discharge circuit of the capacitor acts as a means for measuring the voltage to which the capacitor was previously charged.
  • a Schmitt trigger circuit produces a signal which switches off the current to the coil of the labelling stamp, so that the discharge circuit of the capacitor acts as a means for measuring the voltage to which the capacitor was previously charged.
  • This known velocity compensator has the disadvantage that use of the charged and discharged capacitor does not vary the distance of the article from the work station at which the coil current is switched off in direct proportion to the velocity of the article, and in fact cannot respond correctly to articles moving at low velocities.
  • the solution adopted in this known compensator inevitably leads to difficulties in its implementation since the time interval which is the difference between the time required by an article moving with a given velocity to cover the distance between the second position sensor and the work station, and the actuation period of the labelling stamp is a nonlinear function of the velocity of the article.
  • the known compensator will be subject to drift, due in particular, to temperature sensitivity of the capacitor.
  • the solution provided by the present invention to the problem of determining the moment at which the initiation of the actuator should occur is based on the fact that the difference between the distance of the predetermined location from the work station and the distance covered by an article in the actuation period of the actuator is a linear function of the velocity of approach of the article.
  • a velocity compensator of the present invention is characterised by the said first means being such that the said characteristic of the compensating signal is related to a travel distance which the article travels in a period equal to the actuation period and which is covered by the article within an initial predetermined distance from the said location, the initial predetermined distance being at least as great as the said travel distance, and the said measuring means including means which determine from the compensating signal the distance remaining between the predetermined approach distance and the travel distance and measure the distance travelled by the article from the said location towards the work station up to the extent of the said distance remaining and thereupon provide the said actuation signal.
  • the velocity compensator of this invention can be used with many different apparatuses which perform work operations on articles moved past the apparatus.
  • the velocity compensator can be used with a label applicator, a glue applicator, and an ejector for removing an article from the line, etc.
  • the invention is based on the assumption that article velocity will not be materially varied after the travel distance is measured. This is a safe and realistic assumption because the travel distance is itself an average of instantaneous variations in line speed. Furthermore, by having the travel distance measured close to the work station, there is little opportunity for major line speed changes prior to completion of the work operation. For example, the beginning of the travel distance measurement may be only four inches from the work station.
  • a pulse generator can be used to provide a pulse having a width or duration corresponding to the actuation period.
  • the duration of the pulse can be varied so that the same velocity compensator can be used with different apparatuses.
  • the pulse generator can be initiated by a conventional article detector, such as a photocell or a switch.
  • a shaft encoder or other device for generating pulses representing an incremental distance of article travel can be utilized to provide data relating to article velocity.
  • the measuring means can advantageously include a shift register.
  • a shift register By applying the pulse from the pulse generator to the data input of the shift register and clocking the shift register with the pulses from the shaft encoder, data corresponding to velocity times time i.e. distance is fed directly into the shift register.
  • the shift register has a bit capacity corresponding to the predetermined approach distance. Accordingly, by again initiating the clocking of the shift register when the article reaches the said location and by clocking the shift register at a rate related to the velocity of the article, the first bit of data is clocked out of the shift register when the article is upstream of the work station by a distance equal to the travel distance.
  • Fig. 1 shows a label applicator 11 having a velocity compensator 13 incorporated therein.
  • the label applicator 11 is merely illustrative of the kind of apparatus of actuator with which the velocity compensator 13 can be utilized.
  • the label applicator 11 can be of various different constructions.
  • the label applicator 11 may be of the construction shown and described in U.S. Patent No. 3,885,705.
  • the label applicator 11 includes a supporting structure 14, a supply reel 15, and a take-up reel 17. Both of the reels 15 and 17 are rotatably mounted on the supporting structure 14.
  • a backing strip or carrier strip 19 is wound on the supply reel 15, and a plurality of labels 21 are adhesively secured to and carried by the backing strip.
  • the backing strip 19 extends from the supply reel 15 over guide rollers 23 mounted on the supporting structure 14, over a peeling bar 25, and between a drive roller 27 and an idler roller 29 to the take-up reel 17.
  • the label applicator 11 also includes a housing or vacuum box 31 defining a chamber 33.
  • the housing 31 includes a pervious wall section in the form of a grid 35, one end of which lies closely adjacent the peeling bar 25.
  • the chamber 33 is evacuated to a pressure less than atmospheric so that a suction force is applied through the grid 35.
  • Air under greater than atmospheric pressure is supplied from a source (not shown) through the controllable automatic valve 37, which may be a solenoid valve, and a conduit 39 to a manifold 41. From the manifold 41, the air is transmitted through a plurality of flexible tubes 43 to the grid. Thus, by opening the valve 37, a blast of air under pressure is supplied to the grid 35.
  • the drive roller 27 is driven intermittently and for predetermined periods to draw the backing strip 19 across the peeling bar 25. This causes the peeling bar 25 to function in a conventional manner to remove the labels 21 and supply them in sequence to the grid 35.
  • a label 21 has been removed from the backing strip 19 and supplied to the grid 35.
  • the label 21 is releasably retained on the grid 35 by the vacuum pressure within the chamber 33.
  • an actuation signal is provided by the velocity compensator 13 to the valve 37 to cause the valve to momentarily open. This provides a blast of air under pressure to the grid 35 of sufficient force to remove the label 21 from the grid and transfer it to the article 45.
  • the label 21 is retained on the article 45 by the adhesive carried on one face of the label.
  • Some measurable time is required from the initiation of the actuation signal until the label 21 contacts the article 45. This is the actuation period for the label applicator 11, and it includes all of the electrical, mechanical and other delays inherent in opening the valve 37 permitting the air pressure to rise sufficiently at the discharge ends of the tubes 43 at the grid 35 to remove the label 21, and the time required for the label to travel the distance between the grid 35 and the adjacent surface of the article 45.
  • the article 45 as well as other articles (not shown) are moved via a conveyor 47 through a labelling station at which the article 45 receives the label 21.
  • the conveyor 47 moves continuously; however, as is often the case, conveyor speed may vary.
  • the primary function of the velocity compensator 13 is to provide the actuation signal when the article 45 is sufficiently upstream of the labelling station so that the label 21 will be applied precisely to the desired location on the article.
  • the velocity compensator 13 includes a sensor or detector 49 which, in the embodiment illustrated, is mounted on the supporting structure 14 closely adjacent the labelling station.
  • the detector 49 may be any device which is capable of providing a detection signal when a suitable reference location on the article 45, such as the leading edge of the article 45, reaches a known position referred to herein as a cycle initiation location.
  • detector 49 may be a photocell, a switch, a pneumatically operated detector, etc. In the embodiment illustrated, the detector 49 is a photocell detector.
  • a shaft encoder 51 in the form of an optical encoder is driven by a motor 52 which drives the conveyor 47.
  • the shaft encoder 51 provides a velocity signal in the form of pulses with each of the pulses representing an incremental distance of conveyor 47 and article 45 movement.
  • the detection signal from the detector 49 is transmitted to the set terminal of a set/reset flip-flop 53 to set the flip-flop to its high or "1" state.
  • the output from the flip-flop 53 is provided to the data terminal of a shift register 55, which in the embodiment illustrated, is a serial in, serial out shift register.
  • the velocity signal from the shaft encoder 51 is applied to the clock terminal of the shift register 55. Accordingly, the signal from the flip-flop 53 is loaded into the shift register 55 at a clock rate established by the speed of movement of the article 45.
  • the detection signal is also applied to a pulse generator 57 which may be a one-shot pulse generator.
  • the pulse generator 57 provides a single pulse having a predetermined, but adjustable, pulse width or duration.
  • the pulse width or pulse duration can be manually adjusted to equal the actuation period of the label applicator 11.
  • the single pulse output of the pulse generator 57 can be considered a timing signal.
  • the timing signal from the pulse generator 57 is applied to one input of an OR gate 59 and to the data terminal of a shift register 61, which may be identical to the shift register 55.
  • the output of the OR gate 59 is applied to one input of an AND gate 63 and the other input of the AND gate 63 is coupled to receive the velocity signal from the shaft encoder 51. Accordingly, the AND gate is immediately enabled and its output, which is the velocity signal from the shaft encoder 51, is applied to the clock terminal of the shift register 61.
  • the timing signal from the pulse generator 57 terminates, the AND gate 63 is inhibited and data is no longer shifted in the shift register 61.
  • the bit capacity of the shift register 61 is selected so that its capacity is not fully taken before the end of the timing signal from the pulse generator 57.
  • the secondary initiation signal is transmitted to the other input of the OR gate 59 to enable this gate.
  • the output of the OR gate 59 again enables the AND gate 63 so thereafter the data in the shift register 61 can be clocked through the shift register by the velocity signal from the shaft encoder 51.
  • the data first loaded into the shift register 61 is provided at the output of the shift register 61 to provide an actuation signal.
  • the actuation signal can be processed in any suitable manner so that it can be used to open the valve.
  • the output from the shift register 61 actuates a one-shot generator 65 which in turn operates a driver 67 which provides the actuation signal in usable form to the valve 37 to momentarily open the valve.
  • the operation of the velocity compensator 13 can best be understood by reference to Fig. 2.
  • the detector 49 detects the article 45 and provides the detection signal at a cycle initiation location 69 which is spaced a known distance from a work station 71 with such distance being represented by the line between these two locations.
  • the work station 71 is the location of the leading edge of the article 45 when the label 21 first contacts the article 45. If the compensator keys off of a reference location on the article 45 other than the leading edge, such as the trailing edge, then the work station 71 is the location of such reference when the label 21 first contacts the article 45.
  • a secondary initiation location 73 lies at a known position intermediate the cycle initiation location 69 and the work station 71.
  • the secondary initiation location 73 is the location of the article 45 when the secondary initiation signal is provided by the shift register 55 to the shift register 61 to restart the clocking of the shift register 61.
  • the location 73 is spaced from the location 69 by a first predetermined distance (the initial predetermined distance of Claim 1), and the location 73 is spaced from the work station 71 by a second predetermined distance (the predetermined approach distance of Claim 1).
  • the first predetermined distance in the embodiment illustrated corresponds to the bit capacity of the shift register 55 and the second predetermined distance corresponds to the bit capacity of the shift register 61.
  • the primary function of the shift register 55 is to measure the first predetermined distance and thus to establish the location of the secondary initiation location 73.
  • the location of the secondary initiation location 73 could be accomplished in other ways, such as by the use of a detector or sensor at the secondary initiation location 73.
  • the first and second predetermined distances should be equal.
  • the shift registers 55 and 61 may be identical.
  • the detector 49 responds by providing the detection signal to the pulse generator 57 and to the flip-flop 53.
  • the output from the flip-flop 53 is loaded into the shift register 55 by the velocity signal from the shaft encoder 51 as described above so that the shift register 55 immediately begins tracking the article 45 along the first predetermined distance.
  • the pulse generator 57 provides the timing signal to the shift register 61 so that this data is loaded into the shift register 61 as described above at the clock rate established by the velocity signal from the shaft encoder 51.
  • the information loaded into the shift register 61 is velocity of the article 45 times time where time is the actuation period. Because velocity times time equals distance, a distance corresponding to the distance that the article 45 travels during the actuation period, i.e., the travel distance, is loaded into the shift register 61.
  • the travel distance uses up portions of the first and second predetermined distances as shown in Fig. 2, but it is not greater than either of the predetermined distances.
  • the shift register 61 After the travel distance is loaded into the shift register 61, the OR gate 59 and the AND gate 63 are inhibited whereupon shifting of the data in the shift register 61 terminates. At this point, the shift register 61 has an unused portion or remaining capacity which corresponds to a remaining distance as shown in Fig. 2.
  • the data from the flip-flop 53 continues to be shifted through the shift register 55 at the clock rate established by the velocity signal from the shaft encoder 51.
  • the shift register 55 tracks the article 45 from the cycle initiation location 69 to the secondary initiation location 73 at which time the shift register 55 provides a signal to the OR gate 59, the output from which enables the AND gate 63 whereupon the data in the shift register 61 is shifted toward its output of the register at the clock rate established by the velocity signal from the shaft encoder 51.
  • the first bit of data in the shift register 61 is shifted to its output to form the actuation signal which momentarily opens the valve 37.
  • the leading edge of the article 45 is spaced the travel distance from the work station which is, by definition, the distance that the article will travel during the actuation period. This assures that the article 45 will be at the correct location when the label 21 contacts the selected portion of its surface.
  • the label applicator 11 automatically indexes another label 21 to the grid 35 in a well-known conventional manner.
  • the next article 45 reaches the cycle initiation location 69, the operation described above is repeated. If the shift registers 55 and 61 have identical bit capacities, they are ready to be used in connection with the next article 45 so long as the space between articles to be labelled is equal to or greater than the distance between the cycle initiation location 69 and the work station 71.

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  • Labeling Devices (AREA)

Claims (8)

1. Compensateur de vitesse pour commander le déclenchement d'un actionneur (11) lorsqu'un objet (45) se déplace sur un trajet traversant un poste de travail 71, l'actionneur effectuant une opération de travail sur l'objet au poste de travail et nécessitant une durée d'actionnement depuis le moment où il est déclenché pour effectuer l'opération de travail, le compensateur comportant des premiers moyens (49, 51, 57, 59, 63) sensibles au déplacement de l'objet en amont du poste de travail pour fournir un signal de compensation ayant une caractéristique liée à la vitesse à laquelle l'objet s'approche d'un emplacement (73) qui set trouve à une distance d'approche prédéterminée du poste de travail, des seconds moyens (53, 55) pour fournir un signal de départ lorsque l'objet atteint cet emplacement (73), et des moyens de mesure (61, 65) couplés à ces premiers moyens et ces deuxièmes moyens et sensibles au signal de compensation et au signal de départ pour fournir un signal d'actionnement pour déclencher l'actionneur lorsque l'objet est à une distance du poste de travail qui est egale à la distance que parcourt l'objet pendant la durée d'actionnement, caractérisé en ce que les premiers moyens (49, 51, 57, 59, 63) sont tels que la caractéristique du signal de compensation est liée à une distance de parcours que l'objet parcourt en une durée égale à la durée d'actionnement et qui est couverte par l'objet à l'intérieur d'une distance prédéterminée initiale de l'emplacement (73), cette distance prédéterminée initiale étant au moins aussi grande que la distance de parcours, et en ce que les moyens de mesure (61, 65) comportent des moyens (61) qui déterminent à partir du signal de compensation la distance restante entre la distance d'approche prédéterminée et la distance de parcours et mesurent la distance parcourue par l'objet depuis l'emplacement (73) jusqu'à la valeur de la distance restante, ce sur quoi ils émettent le signal d'actionnement.
2. Compensateur de vitesse selon la revendication 1, caractérisé en ce que les premiers moyens comportent un générateur d'impulsions (59) pour procurer une impulsion ayant une largeur correspondant à la durée d'actionnement et des moyens (51, 59, 63) sensibles à la vitesse de déplacement de l'objet pour procurer un signal numérique pour la durée de l'impulsion, grâce à quoi le signal numérique constitue le signal de compensation.
3. Compensateur de vitesse selon la revendication 1, caractérisé en ce que les moyens de mesure comportent un registre à décalage (61 ayant une capacité de bits correspondant à la distance d'approche prédéterminée et en ce que le signal de compensation est un signal numérique ayant un nombre de bits qui correspond à la distance de parcours.
4. Compensateur de vitesse selon l'une des revendications 1 à 3, caractérisé en ce que les premiers moyens comportent des moyens de détecteur (49) pour fournir un signal de détection lorsque l'objet arrive à une position de déclenchement du cycle (69) en amont du poste de travail, cette position de déclenchement du cycle étant la distance prédéterminée initiale de l'emplacement (73), et en ce que ces premiers moyens sont sensibles au signal détection pour commencer à procurer le signal de compensation.
5. Compensateur de vitesse selon la revendication 1, caractérisé en ce que la distance d'approche prédéterminée est égale ou inférieure à la distance prédéterminée initiale.
6. Compensateur de vitesse selon la revendication 1, caractérisé en ce que l'actionneur comporte des moyens (11) pour appliquer une étiquette sur l'objet.
7. Compensateur de vitesse selon la revendication 1, ou la revendication 6 et l'une quelconque des revendications 2 à 5, caractérisé en ce que les moyens d'application des étiquettes (11) comportent des moyens (31) pour retenir de façon amovible l'étiquette et des moyens (35, 37, 39, 41,43), sensibles au signal d'actionnement pour transférer l'étiquette des moyens de retenue sur l'objet, la durée d'actionnement étant mesurée depuis l'arrivée du signal d'actionnement jusqu'à ce que l'étiquette soit en contact avec l'objet.
8. Compensateur de vitesse selon la revendication 1, caractérisé en ce que les premiers moyens comportent des moyens pour régler cette durée.
EP78300415A 1977-09-26 1978-09-25 Un dispositif de commande dépendant de la vitesse pour remettre en position initiale un dispositif de manoeuvre Expired EP0001683B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US05/836,779 US4106972A (en) 1977-09-26 1977-09-26 Velocity compensator and apparatus incorporating the same
US836779 1979-02-01

Publications (2)

Publication Number Publication Date
EP0001683A1 EP0001683A1 (fr) 1979-05-02
EP0001683B1 true EP0001683B1 (fr) 1981-12-02

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Application Number Title Priority Date Filing Date
EP78300415A Expired EP0001683B1 (fr) 1977-09-26 1978-09-25 Un dispositif de commande dépendant de la vitesse pour remettre en position initiale un dispositif de manoeuvre

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US (1) US4106972A (fr)
EP (1) EP0001683B1 (fr)
JP (1) JPS5457900A (fr)
DE (1) DE2861411D1 (fr)
GB (1) GB1593847A (fr)

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FR2635503A1 (fr) * 1987-08-13 1990-02-23 New Jersey Machine Inc Systeme et procede d'etiquetage
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US5232539A (en) * 1991-02-22 1993-08-03 Grand Rapids Label Company Object labeling machine
US5879507A (en) * 1992-02-21 1999-03-09 Apax Corporation Apparatus for automatically applying adhesive-backed labels to moving articles
US5399228A (en) * 1992-02-21 1995-03-21 Best Label Co., Inc. Apparatus and method for automatically applying adhesive-backed labels to moving articles
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US7537145B2 (en) * 2007-02-01 2009-05-26 Black & Decker Inc. Multistage solenoid fastening device

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Also Published As

Publication number Publication date
US4106972A (en) 1978-08-15
DE2861411D1 (en) 1982-01-28
GB1593847A (en) 1981-07-22
EP0001683A1 (fr) 1979-05-02
JPS5457900A (en) 1979-05-10

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